One Meeeeeelion Blocks!

10

Destroy a total of 1.000.000 blocks. All blocks you destroyed from all levels are counted.

This might require some grinding depending on how much of the environment you destroy while playing through the story. If you need to go back for this one, pick any level and grab the big rocket power up and start shooting the environment. No need to worry if you destroy it all because it rebuilds itself over time.